Characteristics and application scenarios of special blue film adhesive tape for battery energy storage

The special blue film adhesive tape for battery energy storage is a functional adhesive tape with blue PET as the core substrate and high-performance acrylic pressure-sensitive adhesive. It is the core auxiliary material for the assembly of PACK and module of energy storage battery. Its core features focus on six dimensions: high insulation, strong temperature resistance, no residual adhesive, anti-rebound, aging resistance and adaptive automation, which accurately matches the long-term safe operation and large-scale production requirements of energy storage battery.

I. Core performance characteristics

Super electrical insulation, build a safety barrier.

The breakdown voltage of the blue film adhesive tape generally reaches 5–10 kV/mm, far exceeding that of ordinary industrial adhesive tape, which can form reliable insulation and isolation between the aluminum-clad battery cells and the modular metal structural members, and completely eliminate the short-circuit risk caused by the contact between the battery cell shell and conductive parts such as bus bars and brackets. At the same time, it has the characteristics of low leakage current, meets the flame retardant standard of UL94 V-0, and can still pass the flame retardant certification after being fitted with 2mm aluminum foil. Even if the battery cell is overheated or fails locally, it can effectively block the flame spread and reduce the overall safety hazard of the energy storage system.

Stable temperature and weather resistance, suitable for the whole life cycle.

The long-term operating temperature range of energy storage battery is-40℃ to 85℃, and the blue film adhesive tape can keep stable performance in this range, and it will not soften or degum under the high temperature of 120℃ for a short time. The substrate has been modified by UV resistance and aging resistance. Under outdoor or container energy storage scenarios, there is no yellowing or brittle crack after 3000 hours of QUV aging test. After 1000 hours of wet and hot aging, the retention rate of adhesive strength exceeds 80%, which matches the design service life of energy storage batteries for 15-25 years.

Bonding and peeling are accurate and controllable, and no residual glue is easy to rework.

The modified water-based acrylic pressure-sensitive adhesive has strong initial adhesion and stable adhesion, and does not bounce off or become warped at the folded edges and corners of the battery cell stuck at normal temperature and high temperature of 80℃, and is suitable for various battery cell shapes such as formula, cylinder and soft bag. The key advantages are that it can be removed without residual glue, it can be torn for 7 days at room temperature, and there is no need for secondary cleaning when the module is repaired and the battery cell is replaced, which greatly improves the production and after-sales efficiency. This is the exclusive energy storage characteristic that ordinary high-temperature tapes cannot achieve.

Flexible obedience and puncture resistance, physical protection in place.

The thickness of the base material is mostly 80-120μm, which has both flexibility and mechanical strength, and can closely fit the curved surface of the battery cell, L-shaped narrow edge and complex structure of the module, without springback or hollowing after fitting. At the same time, it has excellent puncture resistance and wear resistance, which can effectively resist friction, collision and sharp scratches during battery cell handling and module assembly, protect the battery cell shell from physical damage, and avoid the risk of liquid leakage and short circuit caused by shell damage.

Adapted to automatic production line, high degree of customization.

The blue film adhesive tape supports the width of 3 mm–1000 mm, the length can be customized as required, and the winding diameter can be adapted to the energy storage production equipment such as automatic taping machine and winding machine, which can realize high-speed and continuous wrapping operation. The uniform color is blue, which is convenient for process identification, quality traceability and regular appearance in the production process. Some models can also be customized with double-sided adhesive and perforated breathable models to meet the differentiated requirements of different assembly processes.

Environmental compliance, meet industry standards

The products are halogen-free, asbestos-free and heavy metal-free, and comply with RoHS and REACH environmental protection regulations. At the same time, they have passed the authoritative certification of energy storage industry such as IEC 61215, TV and UL, and meet the compliance requirements of various energy storage projects such as household, industry and commerce, and power grid side.

Second, the core application scenarios

Battery cell monomer wrapped insulation

This is the core application, which is used to completely wrap the outer surface of square and cylindrical aluminum shell batteries, replacing the traditional heat shrinkable film, realizing electrical isolation and physical protection between batteries, avoiding short circuit between batteries when stacking, and improving the appearance consistency of batteries. It is the first process of energy storage PACK assembly.

Internal fixation and insulation of module

In the energy storage module, it is used for bonding and fixing between batteries and between batteries and metal brackets/side plates, replacing mechanical fixing methods such as screws and buckles, and simplifying the assembly process; At the same time, the conductive contact between the battery core and the metal structure is isolated, and the overall insulation level and structural stability of the module are improved.

Insulation protection of bus and wire harness

It is used for local insulation wrapping of bus bars and copper bars in modules, as well as insulation shielding of battery cell tabs and wire harness connectors, to prevent high-voltage components from contacting with surrounding metal parts for short circuit, especially to meet the safety protection requirements of high-voltage and large-capacity energy storage systems.

Sealing and protection of PACK box

When the energy storage PACK box is assembled, it is used for sealing and fixing the joint of the box and the edge of the cover plate, which has the functions of insulation, dustproof and waterproof, reduces the invasion of external moisture and dust into the box, and ensures the stable operation of the battery cells in complex environment.

Repair and after-sales maintenance

With the characteristic of no residual glue, it is widely used in after-sales repair scenes of energy storage systems, such as battery replacement, module disassembly, wire harness maintenance, etc. After tearing, the battery shell and metal parts will not be damaged, and the maintenance cost and the risk of secondary failure will be reduced.

To sum up, the special blue film adhesive tape for battery energy storage has the core advantage of "safe insulation+stable weather resistance+easy construction+reworkability", which is an indispensable key material for the whole assembly process of energy storage battery from battery core to PACK, and directly determines the safety, reliability and production efficiency of energy storage system.